<!DOCTYPE html>
<meta charset="utf-8">
<style>

    .link {
        fill: none;
        stroke: #666;
        stroke-width: 1.5px;
    }

    #licensing {
        fill: green;
    }

    .link.licensing {
        stroke: green;
    }

    .link.resolved {
        stroke-dasharray: 0,2 1;
    }

    zone {
        fill: #ccc;
        stroke: #533;
        stroke-width: 1.5px;
    }

    circle {
        fill: #5cc;
        stroke: #333;
        stroke-width: 1.5px;
    }

    text {
        font: 10px sans-serif;
        pointer-events: none;
        text-shadow: 0 1px 0 #fff, 1px 0 0 #fff, 0 -1px 0 #fff, -1px 0 0 #fff;
    }

</style>
<body>
    <script src="./d3.min.js"></script>
    <script>

        // http://blog.thomsonreuters.com/index.php/mobile-patent-suits-graphic-of-the-day/
        var links = [
        {source: "Microsoft", target: "Amazon", type: "licensing"},
        {source: "Microsoft", target: "HTC", type: "licensing"},
        {source: "Samsung", target: "Apple", type: "suit"},
        {source: "Motorola", target: "Apple", type: "suit"},
        {source: "Nokia", target: "Apple", type: "resolved"},
        {source: "HTC", target: "Apple", type: "suit"},
        {source: "Kodak", target: "Apple", type: "suit"},
        {source: "Microsoft", target: "Barnes & Noble", type: "suit"},
        {source: "Microsoft", target: "Foxconn", type: "suit"},
        {source: "Oracle", target: "Google", type: "suit"},
        {source: "Apple", target: "HTC", type: "suit"},
        {source: "Microsoft", target: "Inventec", type: "suit"},
        {source: "Samsung", target: "Kodak", type: "resolved"},
        {source: "LG", target: "Kodak", type: "resolved"},
        {source: "RIM", target: "Kodak", type: "suit"},
        {source: "Sony", target: "LG", type: "suit"},
        {source: "Kodak", target: "LG", type: "resolved"},
        {source: "Apple", target: "Nokia", type: "resolved"},
        {source: "Qualcomm", target: "Nokia", type: "resolved"},
        {source: "Apple", target: "Motorola", type: "suit"},
        {source: "Microsoft", target: "Motorola", type: "suit"},
        {source: "Motorola", target: "Microsoft", type: "suit"},
        {source: "Huawei", target: "ZTE", type: "suit"},
        {source: "Ericsson", target: "ZTE", type: "suit"},
        {source: "Kodak", target: "Samsung", type: "resolved"},
        {source: "Apple", target: "Samsung", type: "suit"},
        {source: "Kodak", target: "RIM", type: "suit"},
        {source: "Nokia", target: "Qualcomm", type: "suit"}
        ];

        var nodes = {};

        // Compute the distinct nodes from the links.
        links.forEach(function(link) {
            link.source = nodes[link.source] || (nodes[link.source] = {name: link.source});
            link.target = nodes[link.target] || (nodes[link.target] = {name: link.target});
        });

        var width = 960,
        height = 500;

        var force = d3.layout.force()
        .nodes(d3.values(nodes))
        .links(links)
        .size([width, height])
        .linkDistance(60)
        .charge(-300)
        .on("tick", tick)
        .start();

        var svg = d3.select("body").append("svg")
        .attr("width", width)
        .attr("height", height);

        // Per-type markers, as they don't inherit styles.
        svg.append("defs").selectAll("marker")
        .data(["suit", "licensing", "resolved"])
        .enter().append("marker")
        .attr("id", function(d) { return d; })
        .attr("viewBox", "0 -5 10 10")
        .attr("refX", 15)
        .attr("refY", -1.5)
        .attr("markerWidth", 6)
        .attr("markerHeight", 6)
        .attr("orient", "auto")
        .append("path")
        .attr("d", "M0,-5L10,0L0,5");

        var path = svg.append("g").selectAll("path")
        .data(force.links())
        .enter().append("path")
        .attr("class", function(d) { return "link " + d.type; })
        .attr("marker-end", function(d) { return "url(#" + d.type + ")"; });

        var circle = svg.append("g").selectAll("circle")
        .data(force.nodes())
        .enter().append("circle")
        .attr("r", 6)
        .call(force.drag);

        var text = svg.append("g").selectAll("text")
        .data(force.nodes())
        .enter().append("text")
        .attr("x", 8)
        .attr("y", ".31em")
        .text(function(d) { return d.name; });

        // Use elliptical arc path segments to doubly-encode directionality.
        function tick() {
            path.attr("d", linkArc);
            circle.attr("transform", transform);
            text.attr("transform", transform);
        }

        function linkArc(d) {
            var dx = d.target.x - d.source.x,
            dy = d.target.y - d.source.y,
            dr = Math.sqrt(dx * dx + dy * dy);
            return "M" + d.source.x + "," + d.source.y + "A" + dr + "," + dr + " 0 0,1 " + d.target.x + "," + d.target.y;
        }

        function transform(d) {
            return "translate(" + d.x + "," + d.y + ")";
        }

    </script>
